Made it get OpenGL DLL dependent on platform

Program.cs

@@ -10,9 +10,17 @@ public class Program
         private const int GL_FLOAT = 0x1406;
         private const int GL_TRIANGLES = 0x0004;
         private const int GL_COLOR_BUFFER_BIT = 0x4000;
-        private const string OPENGL_DLL = "opengl32";
+
+        #if WINDOWS
+            private const string OPENGL_DLL = "opengl32.dll";
+        #elif OSX
+            private const string OPENGL_DLL = "/System/Library/Frameworks/OpenGL.framework/Versions/A/Libraries/libGL.dylib";
+        #elif LINUX
+            private const string OPENGL_DLL = "libGL.so.1";
+        #endif
         private const string GLFW_DLL = "glfw";
 
+
         // Triangle vertices
         private static float[] vertices = {
             -0.5f, -0.5f,

project.json

@@ -1,7 +1,10 @@
 {
   "version": "1.0.0-*",
   "buildOptions": {
-    "emitEntryPoint": true
+    "emitEntryPoint": true,
+    "define": [
+      "WINDOWS"
+    ]
   },
   "frameworks": {
     "netcoreapp1.0": {

publish.bat

@@ -1,6 +1,27 @@
+:: Back up the source file
+ren Program.cs Program.cs.temp
+:: Windows publish
+copy Program.cs.temp Program.cs
+echo #define WINDOWS > define.txt
+type Program.cs >> define.txt
 dotnet publish -c Release -r win10-x64
+del Program.cs
+:: OSX publish
+copy Program.cs.temp Program.cs
+echo #define OSX > define.txt
+type Program.cs >> define.txt
 dotnet publish -c Release -r osx.10.10-x64
+del Program.cs
+:: Linux publish
+copy Program.cs.temp Program.cs
+echo #define LINUX > define.txt
+type Program.cs >> define.txt
 dotnet publish -c Release -r ubuntu.14.04-x64
+del Program.cs
+del define.txt
+:: Restore backup
+ren Program.cs.temp Program.cs
+:: Copy over GLFW
 copy ".\glfw.dll" ".\bin\Release\netcoreapp1.0\win10-x64\publish\glfw.dll"
 copy ".\libglfw.dylib" ".\bin\Release\netcoreapp1.0\osx.10.10-x64\publish\libglfw.dylib"
 copy ".\libglfw.so" ".\bin\Release\netcoreapp1.0\ubuntu.14.04-x64\publish\libglfw.so"

publish.sh

@@ -1,6 +1,15 @@
+# Back up the source file
+mv Program.cs Program.cs.temp
+echo "#define WINDOWS" | cat . Program.cs.temp > Program.cs
 dotnet publish -c Release -r win10-x64
+rm Program.cs
+echo "#define OSX" | cat . Program.cs.temp > Program.cs
 dotnet publish -c Release -r osx.10.10-x64
+rm Program.cs
+echo "#define LINUX" | cat . Program.cs.temp > Program.cs
 dotnet publish -c Release -r ubuntu.14.04-x64
+rm Program.cs
+mv Program.cs.temp Program.cs
 cp "glfw.dll" "./bin/Release/netcoreapp1.0/win10-x64/publish"
 cp "libglfw.dylib" "./bin/Release/netcoreapp1.0/osx.10.10-x64/publish"
 cp "libglfw.so" "./bin/Release/netcoreapp1.0/ubuntu.14.04-x64/publish"